<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:id="@+id/MyTextView"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<Button
  android:id="@+id/myButton"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="创建Alert对话框"
  />
</LinearLayout>

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    myTextView = (TextView)findViewById(R.id.MyTextView);
    myButton = (Button)findViewById(R.id.myButton);
    //添加AlertDialog.Builder对象
    final AlertDialog.Builder builder = new AlertDialog.Builder(this);
    //为activity中按钮添加按钮事件
    myButton.setOnClickListener(new View.OnClickListener()
    {
    @Override
    public void onClick(View v)
    {
      builder.setTitle("您确定要删除此条信息?").
      //设置确定按钮
      setPositiveButton("Yes", new OnClickListener()
      {
        @Override
        public void onClick(DialogInterface dialog, int which)
        {
          myTextView.setText("删除成功");
        }
      }).
      //设置取消按钮
      setNegativeButton("No", new OnClickListener()
      {
        @Override
        public void onClick(DialogInterface dialog, int which)
        {
          myTextView.setText("取消删除");
        }
      });
       //创建对话框
        AlertDialog alertDialog = builder.create();
        //显示对话框
        alertDialog.show();
    }
    });
  }
}